Cutter head



Aug. 23, 1949. l. H. GEARHART I 2,479,923

CUTTER HEAD Filed Sept. 10, 1946 IN VEN TOR. [57277786] H 5655252323 ATTD RN EYB I 4 bikin /4 1- these exemplifying drawings and mec Patented Aug". 23, 1949 PATENT 25479,:923

@fii T i rsnmal iiiirearhartysaiemgv nppiiaemsem muer 10 1946, .e ia. up. 519 398:

"5 exams w -v 1 +92 M pr en i vention rears to immQvmnis in the gen ralcla sof ot a d. sh mak ng and more "sr e fic ly o a rqte yw te b the exially diustable n iliz a quiqk 'd tah able loc'k ing means between'the cutterhad an" d its. rww rt r tl an nove m ans f r sh el n he. l t e v I -While-thedevice of my invention is well adapted {or various purposes,it=is;especially designedior es -byrsho meke ie ew r ng nd m ll-m ingshoes. In trimmingfdressi-ng," and burnishing th edg s of --the-so s e th e e f 1 the shoe sole is manually held against the-rotary t ot-and "th -p mar ebiset o th i v n n, is hee s m tar tar itut h isrrovi ed iwitirqui kdetachebler en -Qrt e an eable a .ey-o d rent--t ee ---9fcut ers; and whic -is j ldedfor he nre e tinn f he o e a or and I --in ure ace razte and efieetive era ons in dressi s t e s oesel "'Ini s i physical emb diment the nvent i -ineludes aminimum-number ofaeompa tly a ranged parts thatemay =be manufactured with A facility and ataiow eostmf production, and-ithe parts "may be as'sembled with convenience "to "provide "at-tool that 'is'isimple in eonstrlietion and operation.

"The inventien consists essentially in ecertain novel ombinations arrangements of sparts involving the spci fic quick-'detaehabl'e nieans 'f'er locking the cutter headfor -rigid operationwith the ower shaft, and the 'p'articular resiliently supported andr-autoinaticallyadjusted shield for the cutter head, as will'hereinafter be described ""an'd set forth Hf tlie-appndd laiins.

In the accompanying drawings I i iave diselosd one complete-example= ofa-physicalr-ernbodiment of my invention wherein the parts are co nbined endarfanged in accord witl'i'one mode *Iliave Yd vised for the practical "application "of 'the principles of 'my invention, but it" will he unne ,{stood' that'hanges'and' alterations maybe m ne structures, Withid'tlie scope'e n y iclaims, departing fronfthe' prnieiprescf'the invention.

Figure 1 is a view in side elevation showing a rotary cutting tool in which my invention is embodied, and disclosing a portion of the supporting frame and the belt drive for the tool.

Figure 2 is an enlarged longitudinal sectional View through the cutting tool.

Figure 3 is a. face view of the locking bushing of the cutter head.

Figure 4 is a detail view partly in section, as at line 4-4 of Fig. 3.

Fi ur 5 1 a l l d il v w i .1 3 flit/Vibe i iF igure 6,'is detailsectional viewer linelii-"S i F 3. 5 Inthe i ib1y ViW- Fi wli f r l i' t Qnb -pafts i d l edrthj l b z 'fite s i d .powen'sh it 'I of 'a machine tool is jou'fnald in bearings 12, 2 supported'onthe machine frame :S andtheffpulleydhdicated at'R is driven by the belt 'dfiye '4 for revolving or rotating the power sh t. A

e but "i l fit gn II fif i b y y .1 infill$haf h that isefashio nedwith a sloc etY'at' ne end, an'd'the sqqli is fit edi e t is ens hf th ha an secured thereto by meansofespajirof dianitricaliye ense screws-l in 'Q d th t :iieed may revele W he a To provide a resiliently adjustable safetysihiel'd i -or the 2991 ,Iyemploy a, :longitl di-nally slidabl'e cylindrical sleeve} thatiis mounted on ahd revolves 'Withthe shaift-head fi, and the sleeve is provided at diam fttica lly opposite 'poiritswith longitudinally extending guide :grojo'ves or slots 2 :tthrws Whiph h h dit S W$ v7 P3 3? e-e er Whinea s- "T e ink i iic sle r s li nt y ur d 9- ww the ree -end thehe tliee n this rgislgestr seen i Big. 2,: at itsfront end tneshaftfashioned with an-integral centrally arranged axial bossil of reduceddiameter upon :w ic the removableand *i te eha eableimtary reuttin s oe H amounted and :Z Qkfid y means of nickdetarheble fasten n joint, and =for this e id cylindi-ieabboss isr ided with $1 3 :tran ve s ly ler ieat ng radial HI. The rotary nutter unit includes "a bearing cup or cylindrical bushing [5 closed at its outer end and mounted upon the bearing boss, and the inner bore of the bushing is provided with an interior spirally arranged groove it that termimates in a short longitudinally extending entrance groove l1, so that the bushing may be slipped over the boss, the pin l4 enters the slot !1, and a one-eighth turn of the bushing, through the co-action of the pin and groove [6, rigidly locks the bushing on the boss. The bushing is partially turned in the direction opposite to that of the 3 rotation of the shaft to lock the bushing on the boss; and a reverse turn or partial turn of the bushing readily releases the bushing so that it may quickly be detached from the boss.

One of the interchangeable rotary cutters, as H3, is shown mounted with its hub l9 on the ex terior of the bushing and located with the open front end of the tubular slide or sleeve 8, and the I flush ends of the bushing and hub abutting the flat end or face of the shaft head.

The inner annular edge of the cutter I8 is surrounded by and enclosed within an exterior annular flange 20 integral with the outer end of the slide sleeve, which forms a sheath or shield for the cutter, and the spring arrangement between the sleeve and the shaft head provides resilient means for automatically adjusting the sleeve with relation to the cutter.

The cutter l8 is rigidly mounted upon its bearing bushing to revolve with the bushing, when the latter is locked on the boss. The cutter [3 being rigidly mounted on the bushing l by means of a fiat circular disk or plate 2| having a tapered edge on its outer face, and a fastening screw or bolt 22 is passed through a central hole in the disk or plate and threaded in a central opening in the closed end of the bushing. The plate or disk forms an exterior shield for the cutter, and the plate with its screw provides a rigid fastening means for mounting the cutter on its bushing.

The cutter head including the bushing may readily be unlocked from the supporting boss and detached when desired, and the cutter may with outer end of the sleeve forming a shield for the rotary cutter and engageable therewith, said sleeve tending to force said cutter outwardly of said head when said cutter is released from said boss.

3, In a rotary cutting tool, the combination with a power shaft and a head on said shaft having a reduced axial boss, a bushing mounted on said boss, a rotary cutter head'on said bushing, and quick detachable means for locking the cutter head on the bushing, of a spring-pressed slotted sleeve mounted on the shaft-head, guide members carried by the shaft-head and engaged in the slotted sleeve, and an annular flange at the outer end of the sleeve forming a shield for the rotary cutter head and engaging said head,

- said sleeve tending to force said cutter outwardly equal facility be removed from the bushing by backing off the screw and the retaining plate or disk that forms a shield for the cutter.

Having thus fully described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. In a rotary cutting tool, the combination with a power shaft, having an enlarged cylindrical shaft-head on the forward end of said shaft, an axial boss on the forward end of said head centrally thereof, and a radial locking pin on the boss, of a locking bushing mounted for partial rotation on the boss, said bushing having an inner spiral groove co-acting with said radial pin, a rotary cutter mounted on the bushing, an outer disk-shaped shield for the cutter, a fastening screw passed through an opening in the shield and threaded in the bushing, a spring pressed sleeve on said head engaging said cutter to urge said cutter outwardly of said head when the pin in said boss is disengaged from the groove in said bushing, and means carried by said head to slidably retain said sleeve on said head.

2. In a rotary cutting tool, the combination with a power shaft, a shaft-head on said shaft having a reduced axial boss, a bushing mounted on said boss, a rotary cutter head on said bushing, and quick-detachable means for locking the bushing on the boss, of a longitudinally slidable spring pressed sleeve mounted on the shaft-head to rotate therewith, and an annular flange at the of said head when said cutter is released from said boss.

4. In a rotary cutting tool, the combination with a power shaft and a head on the shaft having a reduced axial boss, a radial locking pin on the boss, a locking bushing having an inner spiral groove for co-action with said pin and mounted on the boss, and a rotary cutter head mounted on the bushing, of a longitudinally spring pressed sleeve mounted on the shaft head to rotate therewith, and an annular flange at the outer end of the sleeve forming a shield for the cutter head and engaging the head, said sleeve tending to force said cutter outwardly of said head when said pin is disengaged from said groove.

5. In a rotary cutting tool, the combination with a power shaft and a head on the shaft having a reduced axial boss, a radial locking pin on the boss, a locking bushing having an inner spiral groove co-acting with the pin mounted on the boss, a rotary cutter head mounted on the bushing, an outer disk-shaped shield for the cutter head, and a screw fastening said shield to the bushing, of a spring pressed slotted sleeve mounted on the'shaft head, guide member members carried by the shaft head and projected through the slotted sleeve, and an annular flange at the outer end of the sleeve forming an overhanging shield for the rotary cutter head and engaging the head and tending to force said outter outwardly of said head when said pin is disengaged from said groove.

ISHMAEL H. GEARHART.

REFERENCES orrnn The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 835,820 Evans Nov. 13, 1906 1,011,451 Latham Dec. 12, 1911 1,797,296 Ray Mar. 24, 1931 2,038,693 Ward Apr. 28, 1936 2,077,261 Prodomas Apr. 13, 1937 2,251,470 Stacy Aug. 5. 1941 

